Collision-Induced Microwave Absorption in Compressed Gases. III. CO2—Foreign-Gas Mixtures

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Abstract
Measurements of the increase in dielectric loss accompanying the addition of various foreign gases (He, H2, Ar, N2, CH4, C2H6, and SF6) to CO2 have been made at a frequency near 24 GHz and a temperature of 25°C. This loss is attributed to the dipoles induced in the foreign gas by the molecular quadrupole field of CO2. Excluding mixtures with He and H2, for which the effect is very small, the value of the quadrupole moment of CO2 derived from these losses is about 4.4×10—26 esu in all cases. This is in good agreement with the directly measured value of 4.1×10—26 esu reported by Buckingham and Disch.

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